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Finding the Fourth Proportional to 880, 1,214.40 and 530.72

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Solution

The fourth proportional to 880, 1,214.40 and 530.72 is: 732.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    880 : 1,214.40 = 530.72 : x
  2. Step 2: Convert to fraction form
    880/1,214.40 = 530.72/x
  3. Step 3: Cross multiply
    880x = 1,214.40 × 530.72
  4. Step 4: Simplify right side
    880x = 644,506.37
  5. Step 5: Solve for x
    x = 644,506.37/880
  6. Step 6: Final answer
    x = 732.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.